feat(boostforreddit): add change-oauth-client-id patch

src/main/kotlin/app/revanced/patches/reddit/customclients/AbstractChangeOAuthClientIdPatch.kt

@@ -0,0 +1,57 @@
+package app.revanced.patches.reddit.customclients
+
+import android.os.Environment
+import app.revanced.patcher.data.BytecodeContext
+import app.revanced.patcher.fingerprint.method.impl.MethodFingerprint
+import app.revanced.patcher.patch.*
+import app.revanced.patches.reddit.customclients.boostforreddit.api.patch.ChangeOAuthClientIdPatch
+import app.revanced.patches.reddit.customclients.syncforreddit.api.patch.ChangeOAuthClientIdPatch.Companion.clientId
+import java.io.File
+
+abstract class AbstractChangeOAuthClientIdPatch(
+    private val redirectUri: String,
+    private val fingerprint: MethodFingerprint,
+) : BytecodePatch(listOf(fingerprint)) {
+    override fun execute(context: BytecodeContext): PatchResult {
+        if (ChangeOAuthClientIdPatch.clientId == null) {
+            // Test if on Android
+            try {
+                Class.forName("android.os.Environment")
+            } catch (e: ClassNotFoundException) {
+                return PatchResultError("No client ID provided")
+            }
+
+            File(Environment.getExternalStorageDirectory(), "reddit_client_id_revanced.txt").also {
+                if (it.exists()) return@also
+
+                val error = """
+                    In order to use this patch, you need to provide a client ID.
+                    You can do this by creating a file at ${it.absolutePath} with the client ID as its content.
+                    Alternatively, you can provide the client ID using patch options.
+                    
+                    You can get your client ID from https://www.reddit.com/prefs/apps.
+                    The application type has to be "installed app" and the redirect URI has to be set to "$redirectUri"
+                """.trimIndent()
+
+                return PatchResultError(error)
+            }.let { clientId = it.readText().trim() }
+        }
+
+        return fingerprint.patch(context)
+    }
+
+    abstract fun MethodFingerprint.patch(context: BytecodeContext): PatchResult
+
+    companion object Options {
+        open class ChangeOAuthClientIdOptionsContainer : OptionsContainer() {
+            var clientId by option(
+                PatchOption.StringOption(
+                    "client-id",
+                    null,
+                    "OAuth client ID",
+                    "The Reddit OAuth client ID."
+                )
+            )
+        }
+    }
+}